A live reading in Home Assistant does not prove the same entity supplies long-term statistics. Check the source before buying a different sensor.
Set up the test
Record the entity ID and unit, then inspect recent history. If recent readings are missing, start with the recording path. If readings exist but the statistics graph cannot select the entity, use the documented statistics checks instead of changing several settings at once.
Interpret the result
Compare the entity with an existing compatible sensor. Note whether the expected entity is absent or whether its data appears but uses a different unit. Do not relabel units to make a chart accept incompatible measurements.
Worked example
If a power sensor shows watts now but you need daily energy in kilowatt-hours, confirm that you selected an energy source for that question. A graph cannot turn one type of measurement into the other merely by relabeling it.
Documentation and next step
See the manufacturer’s instructions for supported settings. For a related decision, see home assistant utility meter daily counter check.
